Every dollar you save on purchasing supplies goes directly to your facility's bottom line. Working with a GPO will save you at least 5 percent to 10 percent on your purchase orders - saving just 5 percent in supply purchases can increase profits by $37,000 for the average-sized center and by up to $100,000 for a large, multispecialty center. So if you're not working with a GPO, perhaps you should be. And if you're already using a GPO, then you should be taking advantage of all the benefits in both supply costs and staff efficiency it presents. Here's what you need to know to get all you can out of your GPO.